Split pulley



(No Model.) 2 Sheets-Sheet 2.

J. A. 'IVIACKINNONl SPLIT PULLEY.

Patented Feb. 12, 1889.

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JOHN A. MAOKINNON, OF BROOKLYN, NEV YORK.

SPLIT PULLY.

SPECFICATONforming part of Letters Patent No. 397,654., dated February12, l889.

Application led March 20, 1388.

To all u'i 0712, it Y11M/,y concer/1..'

Be it known that I, .Ici-IN A. MacKinnon, of the city of Brooklyn, in.the county of Kings and State of New York, have invented new and usefulImprovements in Split Pulleys, of which the following a specification.

This invention relates to split pulleys which are divided or splittransversely through the center, so that the pulley can be secured to ashaft at any desired point without the necessity of removing the shaftfrom its bearings or shifting or removin other pulleys already securedto the shaft; and one part ot' fny invention relates particularly tosuch pulleys in which the rim is composed of several wooden rings. l

The object of my invention is to provide simple and efficient fasteningsfor securing together the several rings composing' the rim and a simplefastening for uniting the meeting ends of the sec-tions of the rim;also, to construct the h ub of the pulley in such a manner that it canbe readily and firmly clamped upon the shaft, and, finally, to improvethe construction of the arms connecting the hub and rim.

The invention consists of the improvements, which will be hereinafterfully set forth, and pointed out in the claims.

' In the accompanying drawings, consisting of two sheets, Figure l is aside elevation of my improved pulley, partly in section. Fig. 2 is across-section thereof in line :o fc, Fig. l. Fig. 3 is a cross-sectionin line ji/ y, Fig. l. Fig. 4 is an inside elevation of the fastenin gwhereby the meeting ends of the rim-section are secured together. Fig. 5is a fragmentary elevation of the face ot' the rim. Fig. 6 is a centralvertical section through the hub.' Fig. 7 is a fragmentary section alelevation of two adj ai cent wooden rings of the rim of the pulley. Fig.S is a cross-section of the arms.

Like letters of reference refer to like parts .in the several figures.

'lhe rim el' the pulley consists ot' a number of wooden rings, A,arranged side by side, each of which is preferably composed of a seriesof segments, a, which are secured together by dovetails, as shown inFig. l. Every two rings A are provided in their contiguous sides withtwo dovetail grooves, Z), extending through the rim of the pulley fromthe outer Serial No. 267,820. {No model.)

to the inner side, and forming together a double dovetail openingthrough the rim.

b are double dovetailed keys inserted in the grooves l), wllereby everytwo adjoining rings A are firmly secured together. The grooves l) arearranged obliqu ely or at an augle to the radius of the pulley, and eachlock- 'ing-bar connecting one pair of rings A is arranged in a planewhich intersects the plane of the locking-bars on either side, as shownin Figs. 5 and 7. By this arrangement the locking-bars serve to bracethe rings of the rim in all directions, and form a rigid connectionbetween the rings, which prevents the same from being' moved out ofplace bythe strains to which the pulley is subjected.

Wrhen the rim of the pulley is completed, it is divided into two equalsections or halves by sawing the rim transversely through its center.`The fastenings connecting the meeting ends of the two rim-sections areeach constructed as follows:

c, Figs. 1 and 4E, represents a plate secured to the inner side of oneof the rimsections, at or near the end thereof, and provided with twohooks or lugs, c c2, projecting' beyond the end of the section.

CZ is a plate secured to the inner side of the opposite section of therim, at or near the end thereof, and provided with a hook or lug, d,which engages between the hooks c' C2 of the plate c.

e is a wedge or key arranged between the hooks c, ci, and d of theplates c and d, whereby these plates are interlocked with each other,and the meeting ends of the rimsections are firmly secured together. Theinner or contact faces of the hooks c c2 d', which bear against thesides of the n edge e, are beveled, as showinand the edges of the wedgeare correspondingly beveled. By this construction a dovetailedconnection is formed. between the hooks c c2 d and the wedge, whichproduces a tight connection between the parts and prevents the wedgefrom being loosened in its seat by centrifugal force or otherwise. Theinterlocking lugs operate as a dowel in preventing lateral displacementof the contiguous ends of the rim-sections. The wedge c is held in itsscat against accidental displacement by a cla1nping-nut, c', applied toa screw shank or stem, c2, Aformed at one ALn l'OO

end of the wedge, a washer, c, being int-erposed between thisclamping-nut and the adjacent end of the plate c. The dovetail lugs andkey hold the ends of the rim-sections against radial movement in eitherdirection. The meeting ends of the rim-sections are li rmly drawntogether upon forcing the wedge c into its seat, as the wedge has threebearing-surfaces upon the hooks or lugs c f-T" fl.

The hub of the pulley is composed of two semi-cylindrical parts orhalves, F F', which embrace opposite sides ol' the shaft and areconnected with the rim of the pulley by arms G. Each part F F isprovided on one side, at or near its center, with a projecting hookorlug,j', and on iis opposite side with two similar hooks or vlugs, j"f2, arranged at or near the ends of the parts, so as to form a spacebetween these hooks which receives the central. hook, f, of the otherpart, as shown in Fig's. l, 2, 3, and (i. Upon placing the parts F F ofthe hub against opposite sides of the shaft the central hook,f, of eachpart enters the space between the end hooksf of the opposing part, sothat the hooks of the two parts, when thus interloeked with each other,are located, respectively, on opposite sides of the centerline of thehub. lhese interlocking hooks or lugs also prevent sidewise displacementoi' the contiguous portions of' the hubsections.

7L 7L represent the wedges or keys arranged between the interlockedhooks fffi, whereby the two parts of the hub are tightly clamped againstthe shaft. The hooks or lugs/"j" f2 are beveled similar to the hooks c02d of the fastenings uniting the meeting ends of the rim-sections, andthe wedges 7L 7L are likewise beveled, so as to be held iirmly .in placebetween the hooks aud resist the tendency of the centrifugal force toloosen the fastening.

i' represents clamping-nuts applied tothe threaded ends t" of the wedgest 7U, and yFare washers arranged between thenuts L' and the adjacentends of thehrib-sections F F. These nuts and washers hold the wedgesvlirmly in their seats after being driven home. Upon driving the wedgesinto the dovctailed seats of the hooks f the two parts of the hub aredrawn toward each other and caused to embrace the shaft tight-l y.Sufficient space is left between the parts of the hub to permit the sameto be d rawn. together without coming in contact withv each other. Aseach wedge has three bearing-surfaces-one at the center and one at eachend-all parts of the two halves of the hub are evenly and 'uniformlyclamped upon the shaft. The bore of the hub :is made somewhat largerthan the average size of the shafts upon which the pulley is to be used,and split bushings having l bores of various sizes and iliade of fibrousor other suitable material are used in connection with the hub, so thata pulley having a hub of given size can be applied to shafts ofdifferent diameters by using' a lmshing which properly fits Athe shaft,the pulley being held on t-he shaft by compression of the bushing nearlyacross the width of the face of the pulley.

My improved hub is simple in construction, as the parts thereof areinterehangeable and can be manufactured at comparatively small cost.'.lhe parts l` l1" of the hub are each provided witha segmental flange,F2, to which the inner ends of the arms G are secured.

' These arms are each composed of two plates,

t/ g', 'which are stamped out of sheet metal, and are secured' togetherby eyelets j, which are stan'iped or otherwise formed on one of theplates 5,/ g', and pass through openings formed in the otherplate.Alfter being passed through these openings the eyelets are upset in anysuitable manner. 'lhis forms a simple and inexpensive fastening forsecuring the two plates of each arm together. The plates g lj are eachprovided with a convex. longitudinal rib, lr, which is lorl'ned byindenting the plates. Upon securing the plates together a hollow armhaving an elliptical cross-sectiop is produced, as shown in Fig. 8. Theupper ends of the plates g g are turned outwardly to form lianges l,which are secured to the inner side of the rim of the pulley by boltsIZ. These bolts are arranged in radial openings formed in the rim, andthe heads of the bolts are cmintersunk, as shown in Figs. 1 and 2, thevacant portions of said openings being closed by filling-blocks I2, asshown. The inner flattened ends of the plates g g of the arms G aresecured to opposite sides of the flanges F'2 by rivets or othersuit-able means. The inner ends of these plates are bent to form offsetsor shoulders nawhich enable the innermost portions of the arms to restagainst the outer sides of the :flanges F2.

l claim as my inventionl. ln a pulley, the combination, with the rimcomposed of rings provided in their contiguous sides with obliquedovetail grooves, ofrdovetail keys or locking-bars arranged in saidgrooves, the planes of the keys connect ing one pair of ringsintersecting the plane of the keys connecting the adjacent pair ofrings, substantially as set forth.

2. In a split pulley, the combination, with. two pulley-sections, of aplate secured to one of said sections and provided with two hooks orlugs separated by an open space, a plate secured to the opposing sectionand provided with a hook or lug projecting into the space between thehooks or lugs of the first-mentioned plate, and a key or wedge engagingbetween the inner vfaces of said interlocking hooks or lugs,substantially as set forth.

3. In a split pulley, the combination, with two pulley-sections, of aplate secured to one of said sections and provided with two hooks orlugs having beveled inner faces and separated by an open space, a platesecured to the opposing section and provided with a hookor lugprojecting into the space between the vIOC ITO

hooks orlugs of the lirst-inentioned plate and passing through openingsVin the other plate,

having' a beveled inner face, and a key or wedge hav 1n g beveled sidesengaging between the inner beveled faces o'l' said interlocking hooks orlugs, substantially as set tort-h.

l. In a split pulley, the combination, with the meeting' ends of therim, ol a plate, e, sel eured to one oli' said meeting ends and providedwith two hooks or lugs, e e?, a plate, (l, secured to the opposing endof the rim and wedge, e, engaging between the hooks f" z2 (1 andprovided with a serew-shank, e?, and clamping-nut e, substantially asset t'orth.

5. In a split pulley, a divided hub eon1- posed of two seinieireularsections or halves, i

l F', eaeh provided on one side with two lugs or hooks, ff?, and ontheopposite side with a single hook, f, the hook f ol' one section en,-

gaging lin the space between the hooks f f2 l ot the other seetirnn andkeys or wedges h 7M, engaging' between the hooksf/"f'i, substantially assetforth. l

(l. ln a pulley, the arms G, eaeh Composed ol two plates, g g', oneplate being provided with eyeletsj, 'formed integral therewith andagainst which the eyelets are headed, substantially as set forth.

7. rlhe Combination, with the riin and the divided hub composed of twoparts, eaeh provided with an external flange, F2, of the arms G, eaeheonlposed o'l two bent plates, g g', seeured with their outer ends tothe rini and with their inner ends to the iianges F2 of thehub-seetions, substantially as set forth. provided with a hook or lug,d, and a key or l 8. The combination, with the rini and the divided hubcomposed ofv two parts, each provided with an external flange, F2, ofthe arms G, ea-eh Composed ot' lwo bent pla-tes, g g', provided at theirouter ends with lips or flanges l, whereby they are secured to the rim,and having their inner ends provided with shoulders fm and restingagainst the flanges F2, substantially as set forth.

Titness my hand this 15th day of March, 1888.

JOHN A. MACKINNON.

Witnesses:

JOHN A. MACKINNON, J r., DAHLIA E. HARD.

